Rimuru is building a dungeon in preparation for the upcoming festival. It will feature treasure chests containing weapons made by Kurobe, and Veldora will inhabit the deepest floor as the final boss. Then Milim suddenly shows up with a suggestion...
It's tough coming up with maze 
layouts for a hundred floors.
من الصّعب التّفكير في مخطّطات
لمتاهة من مئة طابق
Bei hundert Ebenen ist es echt schwierig,
sich was für das Labyrinth auszudenken.
Con cien pisos,
no es fácil planear un laberinto.
Con cien pisos,
no es fácil planear un laberinto.
C’est dur d’imaginer
différents paramètres pour cent étages.
È difficile creare la struttura
di un labirinto che ha ben cento piani...
Criar layouts de labirinto para
cem pisos dá trabalho!
Как тяжко продумывать лабиринт,
когда он у тебя на сто этажей…